SPONDYLOSIUM. 221 



Length 5-8 u. ; breadth 5-8 p ; breadth of isthmus 

 2-5-3-2 pi. 



ENGLAND. Mickle Fell, N. Yorks ! Riccall Common, 

 E. Yorks ! Dartmoor, Devon (Harris}. 



WALES. Capel Curig, and Dolbadarn Castle, Car- 

 narvonshire ! Barmouth, Merioneth (CooJce). 



IRELAND . Connaught (Adams) . 



Geogr. Distribution. Germany. Switzerland. Ron- 

 mania. Norway. S. Africa (var.). Azores. 



Some confusion has arisen with regard to this species, owing 

 to the fact that Cooke was under the impression that his Sphc&ro- 

 zosma pygmceum was equivalent to the species described under 

 that name in Eabenh. 'Flor. Europ. Alg.' 1868, p. 150. This is 

 not so, however, for Sphcerozosma pygmceum Kabenh. is the 

 same as Cos) Barium pygmceum Arch., which is a true Cosmarium, 

 and has nothing at all to do with the filamentous Desmids [vide 

 Vol. Ill, p. 73]. 



Var. monile (Turn.) nob. (PL CLX, figs. 20, 21.) 



Spondylosium monile Turn. Desm. Notes, 1893, p. 346, f. 19. [Side view 

 inaccurate.] 

 ' pygtnceuiii var. monile W. G. S. West in manuscript. 



Cells relatively longer than in the type, semicells 

 more broadly oval, semiglobular ; cells in side view 

 gently constricted in the middle. 



Length about 7 JJL ; breadth about 4 y. ; thickness 

 about 3 {jt. 



WALES.- -Trelleck Common, Monmouth (Turn.). 



IRELAND.- -Westport, Mayo ! 



Var. compressum West. (PL CLX, fig. 22.) 



Sp. pygmceum var, compressum West, Alg. Engl. Lake Distr. 1892, p. 6, f. 4. 



Cells in outline subquadrangular, sinus linear, semi- 

 cells compressed, oblong, with their apices flattened. 



Length 5 '5-6^; breadth 7 ^ ; breadth of isthmus 

 2-5 [i. 



ENGLAND. Brother's Water, Westmoreland ! 



